1 /* 2 * KVM Microsoft Hyper-V emulation 3 * 4 * derived from arch/x86/kvm/x86.c 5 * 6 * Copyright (C) 2006 Qumranet, Inc. 7 * Copyright (C) 2008 Qumranet, Inc. 8 * Copyright IBM Corporation, 2008 9 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 10 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com> 11 * 12 * Authors: 13 * Avi Kivity <avi@qumranet.com> 14 * Yaniv Kamay <yaniv@qumranet.com> 15 * Amit Shah <amit.shah@qumranet.com> 16 * Ben-Ami Yassour <benami@il.ibm.com> 17 * Andrey Smetanin <asmetanin@virtuozzo.com> 18 * 19 * This work is licensed under the terms of the GNU GPL, version 2. See 20 * the COPYING file in the top-level directory. 21 * 22 */ 23 24 #include "x86.h" 25 #include "lapic.h" 26 #include "ioapic.h" 27 #include "hyperv.h" 28 29 #include <linux/kvm_host.h> 30 #include <linux/highmem.h> 31 #include <asm/apicdef.h> 32 #include <trace/events/kvm.h> 33 34 #include "trace.h" 35 36 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint) 37 { 38 return atomic64_read(&synic->sint[sint]); 39 } 40 41 static inline int synic_get_sint_vector(u64 sint_value) 42 { 43 if (sint_value & HV_SYNIC_SINT_MASKED) 44 return -1; 45 return sint_value & HV_SYNIC_SINT_VECTOR_MASK; 46 } 47 48 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic, 49 int vector) 50 { 51 int i; 52 53 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 54 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) 55 return true; 56 } 57 return false; 58 } 59 60 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic, 61 int vector) 62 { 63 int i; 64 u64 sint_value; 65 66 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 67 sint_value = synic_read_sint(synic, i); 68 if (synic_get_sint_vector(sint_value) == vector && 69 sint_value & HV_SYNIC_SINT_AUTO_EOI) 70 return true; 71 } 72 return false; 73 } 74 75 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, 76 u64 data, bool host) 77 { 78 int vector; 79 80 vector = data & HV_SYNIC_SINT_VECTOR_MASK; 81 if (vector < 16 && !host) 82 return 1; 83 /* 84 * Guest may configure multiple SINTs to use the same vector, so 85 * we maintain a bitmap of vectors handled by synic, and a 86 * bitmap of vectors with auto-eoi behavior. The bitmaps are 87 * updated here, and atomically queried on fast paths. 88 */ 89 90 atomic64_set(&synic->sint[sint], data); 91 92 if (synic_has_vector_connected(synic, vector)) 93 __set_bit(vector, synic->vec_bitmap); 94 else 95 __clear_bit(vector, synic->vec_bitmap); 96 97 if (synic_has_vector_auto_eoi(synic, vector)) 98 __set_bit(vector, synic->auto_eoi_bitmap); 99 else 100 __clear_bit(vector, synic->auto_eoi_bitmap); 101 102 /* Load SynIC vectors into EOI exit bitmap */ 103 kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic)); 104 return 0; 105 } 106 107 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vcpu_id) 108 { 109 struct kvm_vcpu *vcpu; 110 struct kvm_vcpu_hv_synic *synic; 111 112 if (vcpu_id >= atomic_read(&kvm->online_vcpus)) 113 return NULL; 114 vcpu = kvm_get_vcpu(kvm, vcpu_id); 115 if (!vcpu) 116 return NULL; 117 synic = vcpu_to_synic(vcpu); 118 return (synic->active) ? synic : NULL; 119 } 120 121 static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic, 122 u32 sint) 123 { 124 struct kvm_vcpu *vcpu = synic_to_vcpu(synic); 125 struct page *page; 126 gpa_t gpa; 127 struct hv_message *msg; 128 struct hv_message_page *msg_page; 129 130 gpa = synic->msg_page & PAGE_MASK; 131 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); 132 if (is_error_page(page)) { 133 vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n", 134 gpa); 135 return; 136 } 137 msg_page = kmap_atomic(page); 138 139 msg = &msg_page->sint_message[sint]; 140 msg->header.message_flags.msg_pending = 0; 141 142 kunmap_atomic(msg_page); 143 kvm_release_page_dirty(page); 144 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); 145 } 146 147 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint) 148 { 149 struct kvm *kvm = vcpu->kvm; 150 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); 151 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); 152 struct kvm_vcpu_hv_stimer *stimer; 153 int gsi, idx, stimers_pending; 154 155 trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint); 156 157 if (synic->msg_page & HV_SYNIC_SIMP_ENABLE) 158 synic_clear_sint_msg_pending(synic, sint); 159 160 /* Try to deliver pending Hyper-V SynIC timers messages */ 161 stimers_pending = 0; 162 for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) { 163 stimer = &hv_vcpu->stimer[idx]; 164 if (stimer->msg_pending && 165 (stimer->config & HV_STIMER_ENABLE) && 166 HV_STIMER_SINT(stimer->config) == sint) { 167 set_bit(stimer->index, 168 hv_vcpu->stimer_pending_bitmap); 169 stimers_pending++; 170 } 171 } 172 if (stimers_pending) 173 kvm_make_request(KVM_REQ_HV_STIMER, vcpu); 174 175 idx = srcu_read_lock(&kvm->irq_srcu); 176 gsi = atomic_read(&synic->sint_to_gsi[sint]); 177 if (gsi != -1) 178 kvm_notify_acked_gsi(kvm, gsi); 179 srcu_read_unlock(&kvm->irq_srcu, idx); 180 } 181 182 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr) 183 { 184 struct kvm_vcpu *vcpu = synic_to_vcpu(synic); 185 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; 186 187 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC; 188 hv_vcpu->exit.u.synic.msr = msr; 189 hv_vcpu->exit.u.synic.control = synic->control; 190 hv_vcpu->exit.u.synic.evt_page = synic->evt_page; 191 hv_vcpu->exit.u.synic.msg_page = synic->msg_page; 192 193 kvm_make_request(KVM_REQ_HV_EXIT, vcpu); 194 } 195 196 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic, 197 u32 msr, u64 data, bool host) 198 { 199 struct kvm_vcpu *vcpu = synic_to_vcpu(synic); 200 int ret; 201 202 if (!synic->active) 203 return 1; 204 205 trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host); 206 207 ret = 0; 208 switch (msr) { 209 case HV_X64_MSR_SCONTROL: 210 synic->control = data; 211 if (!host) 212 synic_exit(synic, msr); 213 break; 214 case HV_X64_MSR_SVERSION: 215 if (!host) { 216 ret = 1; 217 break; 218 } 219 synic->version = data; 220 break; 221 case HV_X64_MSR_SIEFP: 222 if (data & HV_SYNIC_SIEFP_ENABLE) 223 if (kvm_clear_guest(vcpu->kvm, 224 data & PAGE_MASK, PAGE_SIZE)) { 225 ret = 1; 226 break; 227 } 228 synic->evt_page = data; 229 if (!host) 230 synic_exit(synic, msr); 231 break; 232 case HV_X64_MSR_SIMP: 233 if (data & HV_SYNIC_SIMP_ENABLE) 234 if (kvm_clear_guest(vcpu->kvm, 235 data & PAGE_MASK, PAGE_SIZE)) { 236 ret = 1; 237 break; 238 } 239 synic->msg_page = data; 240 if (!host) 241 synic_exit(synic, msr); 242 break; 243 case HV_X64_MSR_EOM: { 244 int i; 245 246 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) 247 kvm_hv_notify_acked_sint(vcpu, i); 248 break; 249 } 250 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 251 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host); 252 break; 253 default: 254 ret = 1; 255 break; 256 } 257 return ret; 258 } 259 260 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata) 261 { 262 int ret; 263 264 if (!synic->active) 265 return 1; 266 267 ret = 0; 268 switch (msr) { 269 case HV_X64_MSR_SCONTROL: 270 *pdata = synic->control; 271 break; 272 case HV_X64_MSR_SVERSION: 273 *pdata = synic->version; 274 break; 275 case HV_X64_MSR_SIEFP: 276 *pdata = synic->evt_page; 277 break; 278 case HV_X64_MSR_SIMP: 279 *pdata = synic->msg_page; 280 break; 281 case HV_X64_MSR_EOM: 282 *pdata = 0; 283 break; 284 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 285 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]); 286 break; 287 default: 288 ret = 1; 289 break; 290 } 291 return ret; 292 } 293 294 int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint) 295 { 296 struct kvm_vcpu *vcpu = synic_to_vcpu(synic); 297 struct kvm_lapic_irq irq; 298 int ret, vector; 299 300 if (sint >= ARRAY_SIZE(synic->sint)) 301 return -EINVAL; 302 303 vector = synic_get_sint_vector(synic_read_sint(synic, sint)); 304 if (vector < 0) 305 return -ENOENT; 306 307 memset(&irq, 0, sizeof(irq)); 308 irq.dest_id = kvm_apic_id(vcpu->arch.apic); 309 irq.dest_mode = APIC_DEST_PHYSICAL; 310 irq.delivery_mode = APIC_DM_FIXED; 311 irq.vector = vector; 312 irq.level = 1; 313 314 ret = kvm_irq_delivery_to_apic(vcpu->kvm, NULL, &irq, NULL); 315 trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret); 316 return ret; 317 } 318 319 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint) 320 { 321 struct kvm_vcpu_hv_synic *synic; 322 323 synic = synic_get(kvm, vcpu_id); 324 if (!synic) 325 return -EINVAL; 326 327 return synic_set_irq(synic, sint); 328 } 329 330 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) 331 { 332 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); 333 int i; 334 335 trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector); 336 337 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) 338 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) 339 kvm_hv_notify_acked_sint(vcpu, i); 340 } 341 342 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi) 343 { 344 struct kvm_vcpu_hv_synic *synic; 345 346 synic = synic_get(kvm, vcpu_id); 347 if (!synic) 348 return -EINVAL; 349 350 if (sint >= ARRAY_SIZE(synic->sint_to_gsi)) 351 return -EINVAL; 352 353 atomic_set(&synic->sint_to_gsi[sint], gsi); 354 return 0; 355 } 356 357 void kvm_hv_irq_routing_update(struct kvm *kvm) 358 { 359 struct kvm_irq_routing_table *irq_rt; 360 struct kvm_kernel_irq_routing_entry *e; 361 u32 gsi; 362 363 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, 364 lockdep_is_held(&kvm->irq_lock)); 365 366 for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) { 367 hlist_for_each_entry(e, &irq_rt->map[gsi], link) { 368 if (e->type == KVM_IRQ_ROUTING_HV_SINT) 369 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu, 370 e->hv_sint.sint, gsi); 371 } 372 } 373 } 374 375 static void synic_init(struct kvm_vcpu_hv_synic *synic) 376 { 377 int i; 378 379 memset(synic, 0, sizeof(*synic)); 380 synic->version = HV_SYNIC_VERSION_1; 381 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 382 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED); 383 atomic_set(&synic->sint_to_gsi[i], -1); 384 } 385 } 386 387 static u64 get_time_ref_counter(struct kvm *kvm) 388 { 389 return div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100); 390 } 391 392 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, 393 bool vcpu_kick) 394 { 395 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); 396 397 set_bit(stimer->index, 398 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); 399 kvm_make_request(KVM_REQ_HV_STIMER, vcpu); 400 if (vcpu_kick) 401 kvm_vcpu_kick(vcpu); 402 } 403 404 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer) 405 { 406 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); 407 408 trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id, 409 stimer->index); 410 411 hrtimer_cancel(&stimer->timer); 412 clear_bit(stimer->index, 413 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); 414 stimer->msg_pending = false; 415 stimer->exp_time = 0; 416 } 417 418 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer) 419 { 420 struct kvm_vcpu_hv_stimer *stimer; 421 422 stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer); 423 trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id, 424 stimer->index); 425 stimer_mark_pending(stimer, true); 426 427 return HRTIMER_NORESTART; 428 } 429 430 /* 431 * stimer_start() assumptions: 432 * a) stimer->count is not equal to 0 433 * b) stimer->config has HV_STIMER_ENABLE flag 434 */ 435 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer) 436 { 437 u64 time_now; 438 ktime_t ktime_now; 439 440 time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm); 441 ktime_now = ktime_get(); 442 443 if (stimer->config & HV_STIMER_PERIODIC) { 444 if (stimer->exp_time) { 445 if (time_now >= stimer->exp_time) { 446 u64 remainder; 447 448 div64_u64_rem(time_now - stimer->exp_time, 449 stimer->count, &remainder); 450 stimer->exp_time = 451 time_now + (stimer->count - remainder); 452 } 453 } else 454 stimer->exp_time = time_now + stimer->count; 455 456 trace_kvm_hv_stimer_start_periodic( 457 stimer_to_vcpu(stimer)->vcpu_id, 458 stimer->index, 459 time_now, stimer->exp_time); 460 461 hrtimer_start(&stimer->timer, 462 ktime_add_ns(ktime_now, 463 100 * (stimer->exp_time - time_now)), 464 HRTIMER_MODE_ABS); 465 return 0; 466 } 467 stimer->exp_time = stimer->count; 468 if (time_now >= stimer->count) { 469 /* 470 * Expire timer according to Hypervisor Top-Level Functional 471 * specification v4(15.3.1): 472 * "If a one shot is enabled and the specified count is in 473 * the past, it will expire immediately." 474 */ 475 stimer_mark_pending(stimer, false); 476 return 0; 477 } 478 479 trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id, 480 stimer->index, 481 time_now, stimer->count); 482 483 hrtimer_start(&stimer->timer, 484 ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)), 485 HRTIMER_MODE_ABS); 486 return 0; 487 } 488 489 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, 490 bool host) 491 { 492 trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id, 493 stimer->index, config, host); 494 495 stimer_cleanup(stimer); 496 if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0) 497 config &= ~HV_STIMER_ENABLE; 498 stimer->config = config; 499 stimer_mark_pending(stimer, false); 500 return 0; 501 } 502 503 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count, 504 bool host) 505 { 506 trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id, 507 stimer->index, count, host); 508 509 stimer_cleanup(stimer); 510 stimer->count = count; 511 if (stimer->count == 0) 512 stimer->config &= ~HV_STIMER_ENABLE; 513 else if (stimer->config & HV_STIMER_AUTOENABLE) 514 stimer->config |= HV_STIMER_ENABLE; 515 stimer_mark_pending(stimer, false); 516 return 0; 517 } 518 519 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig) 520 { 521 *pconfig = stimer->config; 522 return 0; 523 } 524 525 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount) 526 { 527 *pcount = stimer->count; 528 return 0; 529 } 530 531 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint, 532 struct hv_message *src_msg) 533 { 534 struct kvm_vcpu *vcpu = synic_to_vcpu(synic); 535 struct page *page; 536 gpa_t gpa; 537 struct hv_message *dst_msg; 538 int r; 539 struct hv_message_page *msg_page; 540 541 if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE)) 542 return -ENOENT; 543 544 gpa = synic->msg_page & PAGE_MASK; 545 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); 546 if (is_error_page(page)) 547 return -EFAULT; 548 549 msg_page = kmap_atomic(page); 550 dst_msg = &msg_page->sint_message[sint]; 551 if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE, 552 src_msg->header.message_type) != HVMSG_NONE) { 553 dst_msg->header.message_flags.msg_pending = 1; 554 r = -EAGAIN; 555 } else { 556 memcpy(&dst_msg->u.payload, &src_msg->u.payload, 557 src_msg->header.payload_size); 558 dst_msg->header.message_type = src_msg->header.message_type; 559 dst_msg->header.payload_size = src_msg->header.payload_size; 560 r = synic_set_irq(synic, sint); 561 if (r >= 1) 562 r = 0; 563 else if (r == 0) 564 r = -EFAULT; 565 } 566 kunmap_atomic(msg_page); 567 kvm_release_page_dirty(page); 568 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); 569 return r; 570 } 571 572 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer) 573 { 574 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); 575 struct hv_message *msg = &stimer->msg; 576 struct hv_timer_message_payload *payload = 577 (struct hv_timer_message_payload *)&msg->u.payload; 578 579 payload->expiration_time = stimer->exp_time; 580 payload->delivery_time = get_time_ref_counter(vcpu->kvm); 581 return synic_deliver_msg(vcpu_to_synic(vcpu), 582 HV_STIMER_SINT(stimer->config), msg); 583 } 584 585 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer) 586 { 587 int r; 588 589 stimer->msg_pending = true; 590 r = stimer_send_msg(stimer); 591 trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id, 592 stimer->index, r); 593 if (!r) { 594 stimer->msg_pending = false; 595 if (!(stimer->config & HV_STIMER_PERIODIC)) 596 stimer->config &= ~HV_STIMER_ENABLE; 597 } 598 } 599 600 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu) 601 { 602 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); 603 struct kvm_vcpu_hv_stimer *stimer; 604 u64 time_now, exp_time; 605 int i; 606 607 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 608 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) { 609 stimer = &hv_vcpu->stimer[i]; 610 if (stimer->config & HV_STIMER_ENABLE) { 611 exp_time = stimer->exp_time; 612 613 if (exp_time) { 614 time_now = 615 get_time_ref_counter(vcpu->kvm); 616 if (time_now >= exp_time) 617 stimer_expiration(stimer); 618 } 619 620 if ((stimer->config & HV_STIMER_ENABLE) && 621 stimer->count) 622 stimer_start(stimer); 623 else 624 stimer_cleanup(stimer); 625 } 626 } 627 } 628 629 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) 630 { 631 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); 632 int i; 633 634 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 635 stimer_cleanup(&hv_vcpu->stimer[i]); 636 } 637 638 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer) 639 { 640 struct hv_message *msg = &stimer->msg; 641 struct hv_timer_message_payload *payload = 642 (struct hv_timer_message_payload *)&msg->u.payload; 643 644 memset(&msg->header, 0, sizeof(msg->header)); 645 msg->header.message_type = HVMSG_TIMER_EXPIRED; 646 msg->header.payload_size = sizeof(*payload); 647 648 payload->timer_index = stimer->index; 649 payload->expiration_time = 0; 650 payload->delivery_time = 0; 651 } 652 653 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index) 654 { 655 memset(stimer, 0, sizeof(*stimer)); 656 stimer->index = timer_index; 657 hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 658 stimer->timer.function = stimer_timer_callback; 659 stimer_prepare_msg(stimer); 660 } 661 662 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) 663 { 664 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); 665 int i; 666 667 synic_init(&hv_vcpu->synic); 668 669 bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT); 670 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 671 stimer_init(&hv_vcpu->stimer[i], i); 672 } 673 674 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu) 675 { 676 /* 677 * Hyper-V SynIC auto EOI SINT's are 678 * not compatible with APICV, so deactivate APICV 679 */ 680 kvm_vcpu_deactivate_apicv(vcpu); 681 vcpu_to_synic(vcpu)->active = true; 682 return 0; 683 } 684 685 static bool kvm_hv_msr_partition_wide(u32 msr) 686 { 687 bool r = false; 688 689 switch (msr) { 690 case HV_X64_MSR_GUEST_OS_ID: 691 case HV_X64_MSR_HYPERCALL: 692 case HV_X64_MSR_REFERENCE_TSC: 693 case HV_X64_MSR_TIME_REF_COUNT: 694 case HV_X64_MSR_CRASH_CTL: 695 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 696 case HV_X64_MSR_RESET: 697 r = true; 698 break; 699 } 700 701 return r; 702 } 703 704 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu, 705 u32 index, u64 *pdata) 706 { 707 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; 708 709 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param))) 710 return -EINVAL; 711 712 *pdata = hv->hv_crash_param[index]; 713 return 0; 714 } 715 716 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata) 717 { 718 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; 719 720 *pdata = hv->hv_crash_ctl; 721 return 0; 722 } 723 724 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host) 725 { 726 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; 727 728 if (host) 729 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY; 730 731 if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) { 732 733 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n", 734 hv->hv_crash_param[0], 735 hv->hv_crash_param[1], 736 hv->hv_crash_param[2], 737 hv->hv_crash_param[3], 738 hv->hv_crash_param[4]); 739 740 /* Send notification about crash to user space */ 741 kvm_make_request(KVM_REQ_HV_CRASH, vcpu); 742 } 743 744 return 0; 745 } 746 747 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu, 748 u32 index, u64 data) 749 { 750 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; 751 752 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param))) 753 return -EINVAL; 754 755 hv->hv_crash_param[index] = data; 756 return 0; 757 } 758 759 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, 760 bool host) 761 { 762 struct kvm *kvm = vcpu->kvm; 763 struct kvm_hv *hv = &kvm->arch.hyperv; 764 765 switch (msr) { 766 case HV_X64_MSR_GUEST_OS_ID: 767 hv->hv_guest_os_id = data; 768 /* setting guest os id to zero disables hypercall page */ 769 if (!hv->hv_guest_os_id) 770 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; 771 break; 772 case HV_X64_MSR_HYPERCALL: { 773 u64 gfn; 774 unsigned long addr; 775 u8 instructions[4]; 776 777 /* if guest os id is not set hypercall should remain disabled */ 778 if (!hv->hv_guest_os_id) 779 break; 780 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { 781 hv->hv_hypercall = data; 782 break; 783 } 784 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; 785 addr = gfn_to_hva(kvm, gfn); 786 if (kvm_is_error_hva(addr)) 787 return 1; 788 kvm_x86_ops->patch_hypercall(vcpu, instructions); 789 ((unsigned char *)instructions)[3] = 0xc3; /* ret */ 790 if (__copy_to_user((void __user *)addr, instructions, 4)) 791 return 1; 792 hv->hv_hypercall = data; 793 mark_page_dirty(kvm, gfn); 794 break; 795 } 796 case HV_X64_MSR_REFERENCE_TSC: { 797 u64 gfn; 798 HV_REFERENCE_TSC_PAGE tsc_ref; 799 800 memset(&tsc_ref, 0, sizeof(tsc_ref)); 801 hv->hv_tsc_page = data; 802 if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE)) 803 break; 804 gfn = data >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT; 805 if (kvm_write_guest( 806 kvm, 807 gfn << HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT, 808 &tsc_ref, sizeof(tsc_ref))) 809 return 1; 810 mark_page_dirty(kvm, gfn); 811 break; 812 } 813 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 814 return kvm_hv_msr_set_crash_data(vcpu, 815 msr - HV_X64_MSR_CRASH_P0, 816 data); 817 case HV_X64_MSR_CRASH_CTL: 818 return kvm_hv_msr_set_crash_ctl(vcpu, data, host); 819 case HV_X64_MSR_RESET: 820 if (data == 1) { 821 vcpu_debug(vcpu, "hyper-v reset requested\n"); 822 kvm_make_request(KVM_REQ_HV_RESET, vcpu); 823 } 824 break; 825 default: 826 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", 827 msr, data); 828 return 1; 829 } 830 return 0; 831 } 832 833 /* Calculate cpu time spent by current task in 100ns units */ 834 static u64 current_task_runtime_100ns(void) 835 { 836 cputime_t utime, stime; 837 838 task_cputime_adjusted(current, &utime, &stime); 839 return div_u64(cputime_to_nsecs(utime + stime), 100); 840 } 841 842 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 843 { 844 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv; 845 846 switch (msr) { 847 case HV_X64_MSR_APIC_ASSIST_PAGE: { 848 u64 gfn; 849 unsigned long addr; 850 851 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) { 852 hv->hv_vapic = data; 853 if (kvm_lapic_enable_pv_eoi(vcpu, 0)) 854 return 1; 855 break; 856 } 857 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT; 858 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); 859 if (kvm_is_error_hva(addr)) 860 return 1; 861 if (__clear_user((void __user *)addr, PAGE_SIZE)) 862 return 1; 863 hv->hv_vapic = data; 864 kvm_vcpu_mark_page_dirty(vcpu, gfn); 865 if (kvm_lapic_enable_pv_eoi(vcpu, 866 gfn_to_gpa(gfn) | KVM_MSR_ENABLED)) 867 return 1; 868 break; 869 } 870 case HV_X64_MSR_EOI: 871 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); 872 case HV_X64_MSR_ICR: 873 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); 874 case HV_X64_MSR_TPR: 875 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); 876 case HV_X64_MSR_VP_RUNTIME: 877 if (!host) 878 return 1; 879 hv->runtime_offset = data - current_task_runtime_100ns(); 880 break; 881 case HV_X64_MSR_SCONTROL: 882 case HV_X64_MSR_SVERSION: 883 case HV_X64_MSR_SIEFP: 884 case HV_X64_MSR_SIMP: 885 case HV_X64_MSR_EOM: 886 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 887 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host); 888 case HV_X64_MSR_STIMER0_CONFIG: 889 case HV_X64_MSR_STIMER1_CONFIG: 890 case HV_X64_MSR_STIMER2_CONFIG: 891 case HV_X64_MSR_STIMER3_CONFIG: { 892 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; 893 894 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index), 895 data, host); 896 } 897 case HV_X64_MSR_STIMER0_COUNT: 898 case HV_X64_MSR_STIMER1_COUNT: 899 case HV_X64_MSR_STIMER2_COUNT: 900 case HV_X64_MSR_STIMER3_COUNT: { 901 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; 902 903 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index), 904 data, host); 905 } 906 default: 907 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", 908 msr, data); 909 return 1; 910 } 911 912 return 0; 913 } 914 915 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) 916 { 917 u64 data = 0; 918 struct kvm *kvm = vcpu->kvm; 919 struct kvm_hv *hv = &kvm->arch.hyperv; 920 921 switch (msr) { 922 case HV_X64_MSR_GUEST_OS_ID: 923 data = hv->hv_guest_os_id; 924 break; 925 case HV_X64_MSR_HYPERCALL: 926 data = hv->hv_hypercall; 927 break; 928 case HV_X64_MSR_TIME_REF_COUNT: 929 data = get_time_ref_counter(kvm); 930 break; 931 case HV_X64_MSR_REFERENCE_TSC: 932 data = hv->hv_tsc_page; 933 break; 934 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 935 return kvm_hv_msr_get_crash_data(vcpu, 936 msr - HV_X64_MSR_CRASH_P0, 937 pdata); 938 case HV_X64_MSR_CRASH_CTL: 939 return kvm_hv_msr_get_crash_ctl(vcpu, pdata); 940 case HV_X64_MSR_RESET: 941 data = 0; 942 break; 943 default: 944 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); 945 return 1; 946 } 947 948 *pdata = data; 949 return 0; 950 } 951 952 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) 953 { 954 u64 data = 0; 955 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv; 956 957 switch (msr) { 958 case HV_X64_MSR_VP_INDEX: { 959 int r; 960 struct kvm_vcpu *v; 961 962 kvm_for_each_vcpu(r, v, vcpu->kvm) { 963 if (v == vcpu) { 964 data = r; 965 break; 966 } 967 } 968 break; 969 } 970 case HV_X64_MSR_EOI: 971 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); 972 case HV_X64_MSR_ICR: 973 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); 974 case HV_X64_MSR_TPR: 975 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); 976 case HV_X64_MSR_APIC_ASSIST_PAGE: 977 data = hv->hv_vapic; 978 break; 979 case HV_X64_MSR_VP_RUNTIME: 980 data = current_task_runtime_100ns() + hv->runtime_offset; 981 break; 982 case HV_X64_MSR_SCONTROL: 983 case HV_X64_MSR_SVERSION: 984 case HV_X64_MSR_SIEFP: 985 case HV_X64_MSR_SIMP: 986 case HV_X64_MSR_EOM: 987 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 988 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata); 989 case HV_X64_MSR_STIMER0_CONFIG: 990 case HV_X64_MSR_STIMER1_CONFIG: 991 case HV_X64_MSR_STIMER2_CONFIG: 992 case HV_X64_MSR_STIMER3_CONFIG: { 993 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; 994 995 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index), 996 pdata); 997 } 998 case HV_X64_MSR_STIMER0_COUNT: 999 case HV_X64_MSR_STIMER1_COUNT: 1000 case HV_X64_MSR_STIMER2_COUNT: 1001 case HV_X64_MSR_STIMER3_COUNT: { 1002 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; 1003 1004 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index), 1005 pdata); 1006 } 1007 default: 1008 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); 1009 return 1; 1010 } 1011 *pdata = data; 1012 return 0; 1013 } 1014 1015 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 1016 { 1017 if (kvm_hv_msr_partition_wide(msr)) { 1018 int r; 1019 1020 mutex_lock(&vcpu->kvm->lock); 1021 r = kvm_hv_set_msr_pw(vcpu, msr, data, host); 1022 mutex_unlock(&vcpu->kvm->lock); 1023 return r; 1024 } else 1025 return kvm_hv_set_msr(vcpu, msr, data, host); 1026 } 1027 1028 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) 1029 { 1030 if (kvm_hv_msr_partition_wide(msr)) { 1031 int r; 1032 1033 mutex_lock(&vcpu->kvm->lock); 1034 r = kvm_hv_get_msr_pw(vcpu, msr, pdata); 1035 mutex_unlock(&vcpu->kvm->lock); 1036 return r; 1037 } else 1038 return kvm_hv_get_msr(vcpu, msr, pdata); 1039 } 1040 1041 bool kvm_hv_hypercall_enabled(struct kvm *kvm) 1042 { 1043 return kvm->arch.hyperv.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE; 1044 } 1045 1046 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) 1047 { 1048 bool longmode; 1049 1050 longmode = is_64_bit_mode(vcpu); 1051 if (longmode) 1052 kvm_register_write(vcpu, VCPU_REGS_RAX, result); 1053 else { 1054 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32); 1055 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff); 1056 } 1057 } 1058 1059 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu) 1060 { 1061 struct kvm_run *run = vcpu->run; 1062 1063 kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result); 1064 return 1; 1065 } 1066 1067 int kvm_hv_hypercall(struct kvm_vcpu *vcpu) 1068 { 1069 u64 param, ingpa, outgpa, ret; 1070 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0; 1071 bool fast, longmode; 1072 1073 /* 1074 * hypercall generates UD from non zero cpl and real mode 1075 * per HYPER-V spec 1076 */ 1077 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) { 1078 kvm_queue_exception(vcpu, UD_VECTOR); 1079 return 1; 1080 } 1081 1082 longmode = is_64_bit_mode(vcpu); 1083 1084 if (!longmode) { 1085 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) | 1086 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff); 1087 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) | 1088 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff); 1089 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) | 1090 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff); 1091 } 1092 #ifdef CONFIG_X86_64 1093 else { 1094 param = kvm_register_read(vcpu, VCPU_REGS_RCX); 1095 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX); 1096 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8); 1097 } 1098 #endif 1099 1100 code = param & 0xffff; 1101 fast = (param >> 16) & 0x1; 1102 rep_cnt = (param >> 32) & 0xfff; 1103 rep_idx = (param >> 48) & 0xfff; 1104 1105 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); 1106 1107 /* Hypercall continuation is not supported yet */ 1108 if (rep_cnt || rep_idx) { 1109 res = HV_STATUS_INVALID_HYPERCALL_CODE; 1110 goto set_result; 1111 } 1112 1113 switch (code) { 1114 case HVCALL_NOTIFY_LONG_SPIN_WAIT: 1115 kvm_vcpu_on_spin(vcpu); 1116 break; 1117 case HVCALL_POST_MESSAGE: 1118 case HVCALL_SIGNAL_EVENT: 1119 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 1120 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL; 1121 vcpu->run->hyperv.u.hcall.input = param; 1122 vcpu->run->hyperv.u.hcall.params[0] = ingpa; 1123 vcpu->run->hyperv.u.hcall.params[1] = outgpa; 1124 vcpu->arch.complete_userspace_io = 1125 kvm_hv_hypercall_complete_userspace; 1126 return 0; 1127 default: 1128 res = HV_STATUS_INVALID_HYPERCALL_CODE; 1129 break; 1130 } 1131 1132 set_result: 1133 ret = res | (((u64)rep_done & 0xfff) << 32); 1134 kvm_hv_hypercall_set_result(vcpu, ret); 1135 return 1; 1136 } 1137